You're right that it's not a complete solution. The overall process on this team aren't good (we never do a retrospective, ever) and I don't get to decide how we solve #2 and #3. The best I can do is bring things up to date, keep it up to date as I run into new info or we add new systems to access, and hope that future new hires are smart enough to check created and last modified dates on documents to find the most recent one.